my Casio calculator is not working

[christel123456]

hello ,
my calculator (casio) shows me 0 whenever i press any button from the last row .
idk what to do please if someone can advise me
thanks

 

[Martaine2005]

Maybe the graphite or similar has worn off the back of the membrane behind the buttons?.
If so, try a conductive paint. Plenty online for repairing remote controls etc.
Or possibly a cracked PCB or broken trace?.
Open it and look.

Martin

 

[bertus]

Hello,

Sometimes the contact area where the button should make contact is dirty or oxidated.
Have a look inside and posts some pictures.

Bertus